WO2014038060A1 - Dc power supply device, and control method for dc power supply device - Google Patents
Dc power supply device, and control method for dc power supply device Download PDFInfo
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- WO2014038060A1 WO2014038060A1 PCT/JP2012/072854 JP2012072854W WO2014038060A1 WO 2014038060 A1 WO2014038060 A1 WO 2014038060A1 JP 2012072854 W JP2012072854 W JP 2012072854W WO 2014038060 A1 WO2014038060 A1 WO 2014038060A1
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- 238000000034 method Methods 0.000 title claims description 18
- 238000009825 accumulation Methods 0.000 abstract 1
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- 239000003990 capacitor Substances 0.000 description 8
- 230000000630 rising effect Effects 0.000 description 8
- 238000003079 width control Methods 0.000 description 8
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 6
- 230000009466 transformation Effects 0.000 description 6
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- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000018199 S phase Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229910001219 R-phase Inorganic materials 0.000 description 1
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32018—Glow discharge
- H01J37/32027—DC powered
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32018—Glow discharge
- H01J37/32045—Circuits specially adapted for controlling the glow discharge
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33573—Full-bridge at primary side of an isolation transformer
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/24—Generating plasma
- H05H1/46—Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H2242/00—Auxiliary systems
- H05H2242/20—Power circuits
- H05H2242/22—DC, AC or pulsed generators
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/001—Arrangements for beam delivery or irradiation
Definitions
- the present invention relates to a DC power supply device, for example, a DC power supply device used for a load such as a plasma generator, and a control method for the DC power supply device.
- a plasma processing process using plasma as a processing target such as a substrate is known.
- DC power is supplied from the DC power supply device to the plasma generator, plasma is generated by, for example, converting the processing gas into plasma in the space inside the plasma generator, and the generated plasma forms a film on the surface of the substrate. Processing and etching are performed.
- a plasma generator corresponds to an electrical load for a DC power supply device.
- a circuit using a resonance converter or a circuit using chopper control is known as a circuit for generating an ignition voltage for generating plasma discharge.
- FIG. 12A and 12B show an ignition voltage generation circuit using a resonant converter
- FIG. 12A shows a circuit example of a series resonant converter
- FIG. 12B shows a parallel resonant converter circuit example.
- an LC series resonance circuit is connected between an inverter circuit and a converter composed of a diode rectifier circuit.
- An LC parallel resonant circuit is connected to a converter composed of a rectifier circuit.
- An ignition voltage generating circuit using a resonant converter raises the ignition voltage by resonance.
- FIG. 12C shows a circuit example of chopper control, in which a chopper circuit is provided between the DC source (Ein) and the inverter circuit.
- the ignition voltage is controlled by the on-duty ratio of the switching element provided in the chopper circuit.
- JP2010-250661 (paragraph [0006]) JP-A-11-229138 (paragraph [0009]) JP 2002-173772 A (paragraph [0032])
- plasma is generated by applying a voltage larger than a set discharge voltage for a certain period, and in the device described in Patent Document 3, a voltage exceeding the rated value is instantaneously applied.
- the plasma discharge is ignited by application.
- the voltage applied to ignite the plasma is a voltage greater than the discharge voltage or the rated voltage applied for a certain period or momentarily.
- the occurrence of plasma discharge varies, and when the applied voltage is low, it is necessary to set the application time longer.
- the DC power supply device that supplies DC power to the plasma generator has a problem that the DC power supply device becomes complicated and large in order to increase the voltage used to generate plasma discharge.
- the inverter circuit when the chopper control is used, the inverter circuit is not provided with a resonance circuit, so that there is a problem that the maximum value of the ignition voltage can be obtained only up to the input DC voltage Ein in the step-down chopper circuit.
- An object of the present invention is to solve the above-described conventional problems, and to simplify and miniaturize a device configuration for forming a high voltage for generating plasma discharge in a DC power supply device that supplies DC power to a plasma generator. .
- a step of generating a plasma discharge in the plasma generator when the power is turned on or restarted is performed.
- a voltage higher than the voltage applied during normal operation called an ignition voltage, is applied from the DC power supply device to the plasma generator to generate plasma discharge.
- the present invention relates to a DC power supply that generates a voltage to be applied to a plasma generator in order to generate a plasma discharge, and a control method for the DC power supply.
- the direct current power supply device of the present invention repeats the process of passing a current through the current source step-down chopper unit included in the direct current power supply device a plurality of times, and sequentially increases the output voltage using the energy of each current to set the ignition set voltage. Boost to.
- the direct current power supply device of the present invention cuts off the current path from the current source step-down chopper section to the output terminal of the direct current power supply device for a short time in order to allow a current to flow in the current source step-down chopper section for a short time.
- a short circuit current is passed through the chopper. Since the current path to the output terminal of the DC power supply device is interrupted, the current of the current source step-down chopper unit is temporarily accumulated in the inductor included in the current source step-down chopper unit.
- the DC power supply is generated by the energy accumulated in the inductor.
- Boost the voltage at the output of the device is boosted to the ignition set voltage by repeating boosting of the output terminal by accumulating and releasing current.
- FIG. 1 is a diagram for explaining an operation for generating a short-circuit current and a step-up operation for an output voltage due to the short-circuit current according to the present invention.
- FIG. 1A is a diagram for explaining an operation of generating a short-circuit current.
- a short circuit current ⁇ i is caused to flow through the current source step-down chopper unit by short-circuiting the positive voltage side and the negative voltage side.
- the energy of the short circuit current ⁇ i is stored in the inductance L.
- FIG. 1B is a diagram for explaining the output voltage boosting operation.
- the energy stored in the inductance L is converted into a voltage, and the output voltage is boosted.
- the voltage of the output capacitor Co is boosted.
- the load side has a capacitor
- the output voltage is boosted by a parallel circuit of the output capacitor Co and the load side capacitor.
- the DC power supply device of the present invention controls the switching element of the bridge circuit of the multiphase inverter connected to the current source step-down chopper unit to short-circuit the positive voltage side and the negative voltage side.
- a switching element is connected between the positive voltage side and the negative voltage side of the output terminal, and this switching element can be controlled to short-circuit the positive voltage side and the negative voltage side.
- the direct current power supply device of the present application accumulates the current flowing in the current source step-down chopper by the short circuit in the inductance L, and converts the accumulated current into energy to boost the output voltage. Since the step-up due to a single short circuit is small, the output voltage is increased stepwise by repeating the step-up process due to the short circuit a plurality of times, and is increased to the ignition set voltage. In addition, the amount of boost due to a single short-circuit can be increased by extending the short-circuit time for short-circuiting the positive voltage side and the negative voltage side. However, the smaller the boost amount, the higher the output voltage. In this case, the boosting width can be finely adjusted, the boosting resolution can be increased, and this is advantageous in controlling the output voltage.
- the short time current path formed in the current source step-down chopper section is obtained by simply short-circuiting the positive voltage side and the negative voltage side in the circuit of the current source step-down chopper section or the circuit of the multiphase inverter section connected to this circuit. Since it can be formed, the DC power supply device can be made simple and compact.
- a DC power supply apparatus for supplying DC power to a plasma generator according to the present invention includes a current source step-down chopper unit constituting a DC source, and the DC output of the current source step-down chopper unit by using a plurality of switching elements to operate multi-phase AC power.
- a multi-phase inverter unit that converts the output of the multi-phase inverter unit into an AC / DC converter, a rectifier unit that supplies the obtained direct current to a load, a chopper control unit that controls the current source step-down chopper unit, and a multi-phase inverter unit
- the control part which has an inverter control part which controls is provided.
- the control unit has two controls: switching control for switching the operation mode and intermittent short-circuit control for forming a current path in the circuit of the current source step-down chopper unit for a very short time.
- the switching control switches between an ignition mode for supplying an ignition voltage for generating a plasma discharge in the plasma generator and a steady operation mode for supplying a steady operation current for continuing the plasma discharge of the plasma generator.
- intermittent short-circuit control the positive and negative voltage sides of the current source step-down chopper and / or multiphase inverter are intermittently shorted, and this short circuit forms a current path in the current source step-down chopper circuit for a very short time. To pass a short-circuit current.
- the control unit causes a short-circuit current to flow through the current source step-down chopper unit by performing intermittent short-circuit control in the ignition mode.
- the energy of this short-circuit current is temporarily stored in the inductor provided in the current source step-down chopper unit.
- the accumulated energy boosts the output voltage of the DC power supply device via the multiphase inverter unit and the rectifier unit during the period until the next short circuit.
- Control is performed to increase the output voltage applied to the plasma generation device by repeating the boosting operation of accumulating current energy due to this short circuit and boosting the output voltage due to conduction.
- the chopper control unit performs pulse width control and controls the input voltage of the current source step-down chopper unit to a predetermined voltage.
- the output voltage of the DC power supply device is determined by the step-up by a plurality of short-circuit operations and the input voltage of the current source step-down chopper unit determined by chopper control.
- the number of short-circuit operations required to boost the voltage to the ignition set voltage is related to the input voltage of the current source step-down chopper section, the time width of the ignition mode, the voltage width boosted by one short-circuit operation, and the like. Therefore, it can be determined based on the configuration and use conditions of the DC power supply device.
- the control unit of the present invention uses, for example, the on-duty ratio of the chopper control of the chopper control unit and the number of intermittent short-circuit controls as parameters, and controls the input voltage of the current source step-down chopper unit according to the on-duty ratio, and the intermittent short-circuit control
- the step-up ratio can be controlled by the number of times, and the voltage rise of the output voltage can be controlled by the input voltage of the current source step-down chopper unit and the step-up ratio.
- the intermittent short-circuit control of the present invention can be performed by an inverter control unit or a chopper control unit.
- the intermittent short-circuit control by the inverter control unit can be performed in a plurality of forms.
- the first form of intermittent short-circuit control by the inverter control unit of the present invention generates a gate pulse signal that controls the pulse width of the switching element of the bridge circuit that constitutes the multiphase inverter, and at the same time, the positive voltage side and the negative voltage of the bridge circuit A short circuit pulse signal that intermittently shorts the side is generated, a control signal is generated by superimposing the generated gate pulse signal and the short circuit pulse signal, and the multiphase inverter unit is controlled by this control signal.
- the gate pulse signal in the control signal converts the direct current into alternating current by controlling the pulse width of each switching element of the bridge circuit of the multiphase inverter.
- the short-circuit pulse signal in the control signal is connected to the positive voltage side of the bridge circuit by simultaneously turning on the pair of switching elements that are connected in series between the positive voltage side and the negative voltage side of the bridge circuit. Short-circuit between the terminals on the voltage side.
- the second form of intermittent short-circuit control by the inverter control unit of the present invention is a gate that generates a gate pulse signal that controls the pulse width of the switching elements of the bridge circuit that constitutes the multiphase inverter, and that turns on each switching element.
- Switching that is turned on by a gate pulse signal among a pair of switching elements that are connected in series between the positive voltage side and negative voltage side terminals of the bridge circuit at any point within the time width of the pulse signal A pulse signal that turns on the switching element that is paired with the element is generated as a short-circuit pulse signal, and a control signal is generated by superimposing the generated gate pulse signal and the short-circuit pulse signal. Control part.
- the gate pulse signal in the control signal converts the direct current into alternating current by controlling the pulse width of each switching element of the bridge circuit of the multiphase inverter.
- the short-circuit pulse signal in the control signal short-circuits the positive voltage side and the negative voltage side of the bridge circuit by the switching element that is turned on by the gate pulse signal and the switching element that is turned on by the short-circuit pulse signal.
- the third form of intermittent short-circuit control by the inverter control unit of the present invention is to simultaneously turn on all the switching elements of the bridge circuit and the gate pulse signal for controlling the pulse width of the switching elements of the bridge circuit constituting the multiphase inverter.
- a pulse signal is generated as a short circuit pulse signal
- a control signal is generated by superimposing the generated gate pulse signal and the short circuit pulse signal
- the multiphase inverter unit is controlled by this control signal.
- the gate pulse signal in the control signal converts the direct current into alternating current by controlling the pulse width of each switching element of the bridge circuit of the multiphase inverter.
- the short-circuit pulse signal in the control signal turns on all the switching elements of the bridge circuit and short-circuits the positive voltage side and the negative voltage side of the bridge circuit.
- the fourth form of intermittent short-circuit control by the inverter control unit of the present invention generates a gate pulse signal for controlling the pulse width of the switching element of the bridge circuit constituting the multiphase inverter, and includes the switching element included in the bridge circuit.
- a pulse signal is generated as a short-circuit pulse signal that simultaneously turns on at least one pair of switching elements among a pair of switching elements that form a pair by connecting the positive voltage side and negative voltage side terminals of the bridge circuit in series.
- the generated gate pulse signal and the short-circuit pulse signal are superimposed to generate a control signal, and the multiphase inverter unit is controlled by this control signal.
- the gate pulse signal in the control signal converts the direct current into alternating current by controlling the pulse width of each switching element of the bridge circuit of the multiphase inverter.
- the short-circuit pulse signal in the control signal turns on at least one switching element of the pair of switching elements that form a pair by connecting the positive voltage side and negative voltage side terminals of the bridge circuit in series. The positive voltage side and the negative voltage side are short-circuited.
- the short circuit current in the current source step-down chopper unit is performed without being affected by the orthogonal transformation operation by the multiphase inverter unit.
- a short-circuit current path is formed in the current source step-down chopper unit for a very short time width of the short-circuit pulse signal, and short-circuit current flows.
- the energy of the short circuit current is stored in the inductor in the current source step-down chopper circuit.
- the short-circuit operation is performed for each short time short-circuit pulse signal, and a plurality of short-circuit operations are performed by intermittently inputting a plurality of short-circuit pulse signals.
- the current source step-down chopper unit is in conduction with the output terminal of the DC power supply until one short-circuit operation ends and the next short-circuit operation.
- the energy stored in the inductor is sent to the output terminal of the DC power supply device to boost the output voltage.
- the energy conversion from current to voltage can be performed by the output capacitor on the output end side of the DC power supply device or the capacitance of the electrode capacity of the plasma generator.
- the current flow from the current source step-down chopper unit to the output end side is performed by the current path that passes through each part of the multiphase inverter unit, transformer, and rectifier constituting the DC power supply device. It is possible to provide a current path that directly connects the two sides and use this current path. In the configuration in which the current is made to flow to the output end side using the directly connected current path, switching means for conducting in the ignition mode and in the non-conducting state in the normal operation mode is provided.
- Short-circuit operation is performed based on each short-circuit pulse signal, and the short-circuit current is reset for each short-circuit operation.
- the output voltage is added to the voltage boosted in the previous short-circuit operation and boosted sequentially.
- the intermittent short-circuit control of the present invention can be performed by the current source step-down chopper control unit in addition to the mode performed by the inverter control unit as described above.
- a short-circuit switching element for short-circuiting between the positive voltage side and the negative voltage side is provided between the connection points of the current source step-down chopper unit and the multiphase inverter unit.
- the intermittent short-circuit control by the current source step-down chopper controller of the present invention generates a short-circuit pulse signal that intermittently shorts the short-circuit switching element.
- the short-circuit pulse signal short-circuits the positive voltage side and the negative voltage side of the output terminal of the current source step-down chopper by turning on the short-circuit switching element.
- the inverter control unit generates a gate pulse signal that controls the pulse width of the switching elements of the bridge circuit constituting the multiphase inverter.
- the gate pulse signal converts the direct current into an alternating current by controlling the pulse width of each switching element of the bridge circuit of the multiphase inverter.
- the current source step-down chopper unit In the control of intermittent short circuit between the current source step-down chopper unit and the multi-phase inverter unit, the current source step-down chopper unit is short-circuited at the current source step-down chopper unit side during short circuit operation between the positive voltage side and the negative voltage side. The current flow from the section to the multiphase inverter section is broken. Therefore, the formation of the short-circuit current of the current source step-down chopper unit is performed without being affected by the orthogonal transformation operation of the multiphase inverter unit.
- a current path is formed in the current source step-down chopper unit for a very short time width of the short-circuit pulse signal, and a short-circuit current flows.
- the energy of the short-circuit current is stored in the inductor in the current source step-down chopper.
- the stored short-circuit current energy boosts the output voltage of the DC power supply until the next short-circuit operation.
- the current flow from the current source step-down chopper unit to the output end side is changed to each part of the multiphase inverter unit, transformer, and rectifier constituting the DC power supply device.
- the current source step-down chopper unit and the output end side can be directly connected.
- the short-circuit current is reset for each short-circuit operation, and the output voltage is added to the voltage boosted in the previous short-circuit operation and boosted sequentially.
- the control unit of the present invention includes a boost control for increasing the output voltage to the ignition set voltage by repeating boosting by a short circuit current a plurality of times in the ignition mode, and a constant voltage for maintaining the output voltage at the ignition set voltage by the chopper control unit. Switch between control and control. The switching from the boost control to the constant voltage control is performed when the output voltage reaches the ignition set voltage.
- the output voltage rises to a predetermined ignition set voltage by boost control, and is maintained by constant voltage control after reaching the ignition set voltage.
- boost control boost control
- constant voltage control after reaching the ignition set voltage.
- the ignition mode can be switched to the steady operation mode based on the occurrence of plasma discharge in the plasma generator.
- any one of constant voltage control, constant current control, and constant power control can be selected.
- the constant voltage control is a control mode in which the set value of the steady operation is switched from the ignition set voltage set in the ignition mode to the steady operation set voltage, and the output voltage is maintained at the steady operation set voltage.
- the constant current control is a control mode in which the set value for steady operation is switched from the ignition set voltage set in the ignition mode to the steady operation set current, and the output current is maintained at the steady operation set current.
- the constant power control is a control mode in which the set value for the steady operation is switched from the ignition set voltage set in the ignition mode to the steady operation set power, and the output power is maintained at the steady operation set power.
- the ignition mode In constant voltage control in the ignition mode, when the output current reaches the ignition set current and the output voltage drops to the plasma generation voltage, the ignition mode is switched to the steady operation mode. Any control selected from current control and constant power control is performed.
- ⁇ ⁇ ⁇ ⁇ Switching from the ignition mode to the steady operation mode is based on the output current and output voltage. Normally, the occurrence of plasma discharge increases the output current, and the output voltage drops from the voltage at the time of ignition. By detecting the output voltage level and the output current level in the plasma generator from the DC power supply device, it is possible to detect the occurrence of plasma discharge and switch from the ignition mode to the steady operation mode.
- the DC power supply device includes a current source step-down chopper unit that constitutes a DC source, a multi-phase inverter unit that converts the DC output of the current source step-down chopper unit into multi-phase AC power by operation of a plurality of switching elements, and a multi-phase inverter.
- a control unit having a rectifying unit that converts the output of the unit into an AC / DC converter and supplies the obtained direct current to the load, a chopper control unit that controls the current source step-down chopper unit, and an inverter control unit that controls the multiphase inverter unit And supply DC power to the plasma generator.
- the control method of the DC power supply device of the present invention includes control modes of intermittent short-circuit control and switching control.
- the switching control is a control for switching between an ignition mode for supplying an ignition voltage for generating a plasma discharge in the plasma generator and a steady operation mode for supplying a steady operation current for continuing the plasma discharge of the plasma generator.
- Intermittent short-circuit control is control in the ignition mode, and intermittently shorts the positive voltage side and negative voltage side of the current source step-down chopper unit or multiphase inverter unit to generate a short-circuit current flowing in the current source step-down chopper unit. .
- the output voltage of the DC power supply device is boosted using the generated short-circuit current to generate an ignition voltage.
- a plasma discharge is generated by applying this ignition voltage to the plasma generator.
- Intermittent short-circuit control is achieved by short-circuiting the positive voltage side and negative voltage side of the bridge circuit by controlling the switching elements of the bridge circuit constituting the multi-phase inverter unit in the inverter control unit, and connecting to the multi-phase inverter unit by this short circuit.
- a short-circuit current is passed through the current-type step-down chopper.
- the inverter control unit is configured to intermittently short-circuit the gate pulse signal for controlling the pulse width of the switching element of the bridge circuit constituting the multiphase inverter and the short-circuit pulse for intermittently short-circuiting the positive voltage side and the negative voltage side of the bridge circuit in the intermittent short-circuit control.
- the control signal is generated by superimposing the gate pulse signal and the short-circuit pulse signal.
- the control circuit controls the multi-phase inverter, and the short-circuit pulse signal connects the positive voltage side and negative voltage side terminals of the bridge circuit in series to simultaneously turn on the pair of switching elements, and the bridge circuit Short-circuit between the positive voltage side and negative voltage side terminals.
- the control unit performs boost control for increasing the output voltage to the ignition set voltage by repeating boosting by a short circuit current a plurality of times, and constant voltage control for maintaining the output voltage at the ignition set voltage by the chopper control unit. Change over. Switching from the boost control to the constant voltage control is performed after the output voltage is increased by the boost control and the output voltage reaches the ignition set voltage.
- the output voltage V o can be controlled by the input voltage in the current source step-down chopper unit and the step-up ratio by step-up control.
- the input voltage in the current source step-down chopper unit can be controlled using the on-duty ratio of the chopper control of the chopper control unit as a parameter, and the step-up ratio can be controlled using the number of intermittent short-circuit controls as a parameter.
- the chopper controller controls the input voltage of the current source step-down chopper by the on-duty ratio, controls the boost ratio by the number of intermittent short-circuit controls, and increases the output voltage by these input voltage and boost ratio. Control.
- the chopper controller performs constant voltage control in the ignition mode, and performs any control selected from constant voltage control, constant current control, and constant power control in the steady operation mode. In control selected from constant voltage control, constant current control, and constant power control, control is performed to maintain the voltage set value, current set value, or power set value, which are set values set in each control.
- Constant voltage control performed by the ignition mode the output voltage V o is performs control so that the ignition set voltage, the input voltage of the current type step-down chopper unit performs a chopper control so that a predetermined voltage.
- the control performed in the steady operation mode is a control set value (voltage set value, current setting) in which the output is selected in the steady operation mode so that the plasma discharge is maintained after the plasma discharge is generated in the plasma generator. Value or power setting value).
- the switching from the ignition set voltage to the set value set in the steady operation mode is performed based on the occurrence of plasma discharge in the plasma generator. Whether or not plasma discharge has occurred in the plasma generator can be determined by monitoring the output voltage and output current.
- the output current supplied from the DC power supply to the plasma generator is switched from the ignition current to the steady operation current at the time of switching from the ignition mode to the steady operation mode.
- the ignition current becomes the largest ignition current at the final stage of switching from the ignition mode to the steady operation mode.
- the ignition current when the ignition mode is switched to the steady operation mode is obtained in advance and set as the ignition setting current. Further, when plasma discharge occurs, the output voltage becomes lower than the ignition set voltage, so a low voltage when plasma discharge occurs is determined as the plasma generation voltage.
- the output current is compared with the ignition set current, the output voltage is compared with the plasma generation voltage, and when the output current reaches the ignition set current and the output voltage drops to the plasma generation voltage, the plasma discharge Judgment is made when this occurs.
- the control set value is selected from the ignition set voltage of the constant voltage control in the ignition mode, and from the constant voltage control, constant current control, and constant power control in the steady operation mode. Switch to the control setting value and perform the selected control.
- a constant voltage, a constant current, or a constant power is applied to the plasma generator by constant voltage control, constant current control, or constant power control, and a stable plasma discharge is maintained.
- the apparatus configuration for forming a high voltage that generates plasma discharge can be simplified and miniaturized.
- the voltage application time required for generating plasma discharge can be shortened without using a large-scale and complicated DC power supply device.
- FIGS. 2 is a diagram for explaining the overall configuration of the DC power supply device of the present invention
- FIG. 3 is a diagram for explaining a configuration example of a chopper control unit provided in the DC power supply device of the present invention.
- the DC power supply device 1 of the present invention shown in FIG. 2 is input from the rectifying unit 10 that rectifies the AC power of the AC power source 2, the snubber unit 20 that forms a protection circuit that suppresses transiently high voltage, and the rectifying unit 10.
- a current source step-down chopper unit 30 that converts a DC power voltage into a predetermined voltage and outputs a DC current
- a multi-phase inverter unit 40 that converts a DC output of the current source step-down chopper unit 30 into a multi-phase AC output
- a multi-phase inverter A multiphase transformer 50 that converts the AC output of the unit 40 into a predetermined voltage
- a multiphase rectifier 60 that converts the AC of the multiphase transformer 50 into DC.
- the switching element Q 1 is, steps down by chopper controlling the DC voltage rectified by the rectifier unit 10. Voltage control by the current-step-down chopper unit 30 is performed by controlling the ON duty ratio is the ratio of the on-off switching element Q 1.
- the direct current reactor L F1 smoothes the current of the chopper controlled direct current.
- the DC power supply device of the present invention causes a short-circuit current to flow through the current source step-down chopper unit 30 by a short-circuit operation, and temporarily stores this short-circuit current in the DC reactor L F1 .
- the stored energy of DC reactor L F1 boosts the output voltage until the next short-circuit operation.
- the multi-phase inverter unit 40 receives the direct current smoothed by the current source step-down chopper unit 30 and performs orthogonal transformation by controlling the switching elements of the bridge circuit included in the multi-phase inverter unit 40.
- the multi-phase inverter unit 40 includes a multi-phase inverter circuit configured by bridge-connecting switching elements corresponding to the number of phases.
- the three-phase inverter circuit includes a bridge circuit composed of six switching elements.
- the switching element for example, a semiconductor switching element such as an IGBT or a MOSFET can be used.
- Each switching element of the multiphase inverter circuit performs a switching operation based on the control signal of the inverter control unit 80, converts DC power into AC power, and outputs the AC power.
- the AC output of the multi-phase inverter unit 40 can obtain a high frequency output by increasing the switching frequency of the switching element.
- the current source inverter device supplies a high frequency output of 200 kHz, for example, to the load unit.
- the multiphase inverter circuit performs switching operation of the switching element at a high frequency. As described above, when the switching element is switched at a high frequency, the AC output includes a high frequency ripple component.
- the multiphase rectification unit 60 rectifies the AC output of the multiphase inverter unit 40 and supplies the DC output to the load.
- a conventionally known multiphase rectification unit may be configured to include a DC filter circuit in the output unit. This DC filter circuit removes the high-frequency ripple component contained in the AC output of the multiphase inverter unit.
- DC filter circuit can be configured by the output capacitor C FO connected in series with the output reactor L FO in parallel connected to the output terminal (not shown).
- the DC output of the multiphase rectification unit 60 is output via the wiring inductance L 0 provided in the wiring 90, and is supplied to the plasma generator 4 by the output cable 3 connecting the DC power supply device 1 and the plasma generator 4. .
- the DC power supply device 1 of the present invention can use parasitic impedance instead of the DC filter circuit in the multiphase rectifier 60 as a configuration for removing the high-frequency ripple component.
- the inductance L 0 of the wiring 90 between the polyphase rectifier 60 and the output terminal is used as the inductance
- the capacity of the output cable 3 connected between the DC power supply device 1 and the load is used as the capacity, or
- the output capacity Co of the plasma generator 4 can be used.
- the above-described parasitic impedance of the multiphase inverter section and the capacity of the output cable and electrode capacitance substantially constitute a DC filter circuit, and reduce high frequency ripple components included in the AC output of the multiphase inverter section.
- the configuration using the parasitic impedance of the electrode capacitance of the wiring impedance and output cables and a plasma generating apparatus is large enough to supply the capacitive component is arc energy P c corresponding to the output capacitor C FO ,
- the high-frequency ripple component can be removed and the arc energy Pc can be supplied.
- the high frequency ripple component has a characteristic that increases when the driving frequency of the multiphase inverter circuit is lowered. Therefore, by increasing the driving frequency of the polyphase inverter circuit, the need for output capacitors C FO and output reactor (inductance) L FO can be reduced. Moreover, the energy which DC power supply device 1 holds inside can be suppressed by raising the drive frequency of a multiphase inverter circuit.
- the DC power supply device 1 of the present invention includes a chopper control unit 70 that controls the current source step-down chopper unit 30 and an inverter control unit 80 that controls the multiphase inverter unit 40.
- Chopper control unit 70 is a circuit for chopper control of the switching element to Q 1 current-step-down chopper 30, the chopper current is an output current of the switching element Q 1, and detects an output voltage of the DC power supply device 1, the Based on the detected value of the chopper current and the output voltage, control is performed so that the output of the current source step-down chopper unit 30 becomes a predetermined current value and a predetermined voltage value set in advance.
- the inverter control unit 80 controls the switching operation of the switching element connected to each arm constituting the bridge circuit of the multiphase inverter unit 40.
- the multiphase inverter unit 40 orthogonally converts the input direct current into alternating current by controlling the switching element.
- the multiphase inverter unit 40 is configured by a bridge circuit having six arms as shown in FIG. Each arm is provided with six switching elements Q R , Q S , Q T , Q X , Q Y , and Q Z.
- a switching element Q R and the switching element Q x connected in series, a switching element Q S and the switching element Q Y are connected in series, connected in series and a switching element Q T and the switching element Q z.
- connection point R between the switching element Q R and the switching element Q x is connected as the R phase of the three-phase transformer 51
- the connection point S between the switching element Q S and the switching element Q Y is the S phase of the three-phase transformer 51
- connection point T between the switching element Q T and the switching element Q Z is connected as the T phase of the three-phase transformer 51.
- PWM PWM control that changes the magnitude of output current under constant input current is known as control of the multiphase inverter.
- PWM control a pulse control signal is formed for each phase by comparing a carrier wave and a modulated wave.
- the pulse control signal of each phase has a conduction period of 120 °, and the ON / OFF of the switching element of each arm of the inverter is controlled by this pulse control signal.
- R-phase, S-phase, and T-phase currents having a phase difference are formed.
- a feedback signal is fed back to the chopper control unit 70 and the inverter control unit 80 from the output end of the DC power supply device 1 or the load side.
- the feedback signal can be, for example, the voltage or current at the output end of the DC power supply device 1.
- the chopper controller 70 performs pulse voltage control on the switching element of the current source step-down chopper 30, performs constant voltage control in the ignition mode, and selects one of constant voltage control, constant current control, or constant power control in the steady operation mode. Control. Control is performed by switching to different set values in the ignition mode and the steady operation mode. In the ignition mode, the ignition set voltage V IGR is set. In the steady operation mode, the constant voltage control is set to the steady operation set voltage V R , the constant current control is set to the steady operation set current I R , and the constant power control is set to the steady state. set the operating set power P R.
- Setting values in each control the steady operation mode from the ignition setting voltage V IGR constant voltage control of the steady-state operation setting voltage V R, the constant steady operation of the current control set current I R, the steady operation set power P R of the constant power control
- the switching can be performed by detecting that the output voltage and the output current have reached predetermined values. For example, when the set value is switched by detecting the output voltage and output current, the output current increases in the ignition mode, reaches the ignition set current set corresponding to the start of plasma discharge, and the output voltage is plasma. The time point when the voltage drops to the generated voltage is detected, and the set value is switched at this time point.
- FIG 3 shows the control set values (the steady operation set voltage V R , the steady operation set current I R , the steady operation set power P, and the ignition set voltage V IGR selected based on the detection of the output voltage V o and the output current I o. R ).
- the chopper control unit 70 compares the output current I o and the ignition set current I IGR as a configuration for switching the set value based on the comparison between the output current and output voltage and each set value, and generates the output voltage V o and plasma generation. compares the set voltage V PLR, the output current I o is the ignition setting current I IGR above, and a comparison circuit 70e for outputting a switching signal when the output voltage V o is equal to or less than the plasma generating set voltage V PLR Prepare.
- the ignition set current I IGR can be stored in the memory means 70f, and the plasma generation set voltage V PLR can be stored in the memory means 70g.
- the ignition setting voltage V IGR and a constant k may be stored, and the plasma generation setting voltage V PLR may be set by multiplying the ignition setting voltage V IGR by the constant k.
- the constant k can be arbitrarily set in the range of 0.2 to 0.9, for example.
- Chopper control unit 70 in the pulse width control of the switching element Q 1, the set value of the control, the ignition setting voltage V IGR performing constant voltage control in the ignition mode, the set value of the control selected in the steady operation mode (constant voltage).
- a switching circuit 70b for switching to a steady operation set voltage V R for control, a steady operation set current I R for constant current control, and a steady operation set power P R for constant power control.
- Switching circuit 70b outputs an ignition setting voltage V IGR, steady operation setting voltage V R, the steady operation set current I R, one of steady operation set power P R based on the switching signal outputted from the comparison circuit 70e.
- Ignition set voltage V IGR it can be stored in the memory means 70c
- steady operation setting voltage V R the steady operation set current I R
- steady operation setting values such as steady operation set power P R is stored in the memory unit 70d Can do.
- Each of the memories 70c to 70g is not limited to the configuration provided in the chopper control unit 70.
- the memories 70c to 70g may be provided in an arbitrary component such as a control unit that controls the entire DC power supply device, or may be input from outside the DC power supply device It is good.
- the chopper control unit 70 includes a switching element control signal generation circuit 70a, and performs switching control of constant voltage control, constant current control, or constant power control by pulse width control so that the output becomes a set value. Is generated.
- Switching element control signal generator circuit 70a includes a switching ignition set voltage V IGR sent from the switching circuit 70b, the steady operation setting voltage V R, the steady operation set current I R, one of steady operation set power P R as a set value generates a device control signal to the chopper controls the switching element to Q 1 current-step-down chopper unit 30.
- the inverter control unit 80 controls the on / off operation of the switching element of the multiphase inverter unit 40, and performs the orthogonal conversion from DC to AC and generates a short-circuit current in the current source step-down chopper unit.
- the gate pulse signal G is generated in any of the ignition mode and the steady operation mode.
- the generation of the short-circuit pulse signal P i is started at the rising edge of the ignition signal IG, and the generation is stopped by the switching signal that is the output of the comparison circuit 70e of the chopper control unit 70.
- the inverter control unit 80 adds the gate pulse signal generation circuit 80c that generates the gate pulse signal G, the short circuit pulse signal generation circuit 80d that generates the short circuit pulse signal P i , and the gate pulse signal G and the short circuit pulse signal P i.
- the multi-phase inverter unit 40 performs orthogonal transformation by the gate pulse signal G in the control signal, and short-circuits the positive voltage side and the negative voltage side by the short-circuit pulse signal P i in the control signal. Apply short circuit current.
- FIG. 5 illustrates an example in which the positive voltage side and the negative voltage side of the multiphase inverter unit are short-circuited by inverter control, and a short-circuit current is caused to flow through the current source step-down chopper unit by this short-circuit operation.
- the chopper controller controls the IG voltage rise interval (S1a to S1c) that boosts the output voltage to the ignition set voltage, and the IG voltage constant voltage interval control (S1d to S1f) that maintains the boosted output voltage at the ignition set voltage
- the ignition mode is controlled by these two sections.
- the inverter control unit performs inverter control by the gate pulse signal G and intermittent short-circuit control by the short-circuit pulse signal P i during the ignition mode S1.
- IG voltage rise section Control of IG voltage rise section
- control is performed to boost the output voltage to the ignition set voltage.
- a gate pulse signal G for driving and controlling the switching elements of each phase of the bridge circuit included in the multi-phase inverter unit is generated (S1A), and an ignition (IG) generation signal that determines an ignition mode section is started (S1B). ).
- a short-circuit pulse signal P i is generated in accordance with the rise of the ignition (IG) generation signal (S1C).
- FIG. 6 (a) shows an ignition (IG) generating signals
- FIG. 6 (b) shows a gate pulse signal G
- FIG. 6 (c) shows a short circuit pulse signal P i.
- FIG. 6B shows a state in which the short-circuit pulse signal P i is superimposed on the gate pulse signal G.
- the multi-phase inverter unit is controlled by the gate pulse signal G generated by S1A (S1D), and the ignition (IG) generation signal generated by S1C is used between the positive voltage side and the negative voltage side of the multi-phase inverter unit (bridge circuit Short the upper and lower ends (S1E).
- the short-circuit pulse signal P i is generated for a minute time width T ion, and together with the gate pulse signal G, the switching elements constituting the bridge circuit of the inverter unit are turned on to short-circuit the positive voltage side and the negative voltage side.
- the short pulse signal P i superimposed on the gate pulse signal G R and the gate pulse signal G X, an ON state and the switching element Q R and the switching element Q X of the bridge circuit, to short-circuit the upper and lower ends of the bridge circuit .
- the chopper controller sets the ignition set voltage V IGR as a voltage set value for constant voltage control of the output voltage V o with the rise of the ignition (IG) generation signal (S1a).
- FIG. 6D shows the output voltage V o and the output current I o .
- the output voltage V o shows an ignition setting voltage V IGR as the voltage setting value of the constant voltage control of the ignition mode the output voltage V o, as the voltage set value of the constant voltage control during the steady operation of the output voltage V o It shows a steady operation setting voltage V R.
- an ignition set current IIGR is shown as a current set value in the ignition mode of the output current Io .
- the short circuit current ⁇ i flows through the current source step-down chopper by the S1E short circuit operation process.
- This short-circuit current ⁇ i is accumulated in an inductor provided in the current source step-down chopper (S1b).
- Short pulse signals P i stops short operation by the fall of the output voltage V o by the energy stored in the inductor is boosted (S1F).
- the output voltage V o is compared with the ignition set voltage V IGR, and if the output voltage V o has not reached the ignition set voltage V IGR , the next short-circuit pulse signal P i causes the negative voltage on the positive side of the multiphase inverter section to be negative to short-circuit between the (upper and lower ends of the bridge circuit) between the voltage side, it performs processing for boosting the output voltage V o by the short circuit current ⁇ i a (S1E ⁇ S1F). Until the output voltage V o reaches the ignition set voltage V IGR , the step-up process by the short-circuit operation of S1E to S1F is repeated.
- the output voltage V o is stepped up stepwise by an intermittent short circuit operation by repeating S1E to S1F.
- a portion indicated by a symbol A indicates a step-up state in which the voltage goes toward the ignition set voltage V IGR .
- FIG. 7 shows a short circuit state at the time of ignition.
- the switching element Q R and the switching element Q X are simultaneously turned on to short-circuit between the positive voltage side and the negative voltage side (upper and lower ends of the bridge circuit). Is shown.
- the switching element Q R When the switching element Q R is in the on state by the gate pulse signal G R , the switching element Q X is turned on by the short circuit pulse signal P i at any time in the on state. As a result, the positive voltage side and the negative voltage side PN (upper and lower ends of the bridge circuit) are short-circuited via the switching element Q R and the switching element Q X.
- a short circuit current ⁇ i flows through the current source step-down chopper as shown in FIG.
- the short-circuit current ⁇ i flows for a minute time width T ion (n) that is the signal width of the short-circuit pulse signal P i .
- the short circuit current ⁇ i is reset every short circuit operation.
- T ion (n) n-th short operation of T ion (n) is completed, until the short circuit operation of the next (n + 1) th T ion (n + 1) is started, the direct current by a short operation of the T ion (n) reactor L
- the energy J i (n) stored in F1 is supplied to the load through the inverter unit, the transformer, and the rectifier.
- the output side capacitance C OT can be the output capacitance C FO and the electrode capacitance C o of the plasma generator as a load.
- V o (n) ⁇ (L F1 / C OT ) ⁇ ⁇ i 1 2 + V o (n ⁇ 1) 2 ⁇ 1/2 (4) Equation (4) represents the output voltage V o (n) when the short-circuit operation is repeated n times.
- V o (1) ⁇ (L F1 / C OT ) ⁇ ⁇ i 1 2 ⁇ 1/2 (5)
- V o (2) ⁇ (L F1 / C OT ) ⁇ ⁇ i 1 2 + V o (1) 2 ⁇ 1/2 (6)
- V o (3) ⁇ (L F1 / C OT ) ⁇ ⁇ i 1 2 + V o (2) 2 ⁇ 1/2 (7)
- Equation (4) shows that the output voltage V o (n) at the time of ignition can be selected by the number n of short-circuit operations.
- short-circuit current .DELTA.i 1 is proportional to the input voltage V in as shown in equation (1).
- Input voltage V in is the output voltage of the current-step-down chopper unit, the output voltage is determined by the on-duty ratio of the switching element to Q 1 current-step-down chopper unit.
- the step-up ratio of the output voltage V o (n) can be determined by the on-duty ratio of the switching element to Q 1 number n, and the current-step-down chopper of the short-circuit operation.
- the number n of the short-circuit operation is performed in the ignition mode, when the short-circuit pulse signal is output in synchronization with the gate pulse signal, the time until the ignition mode is started and released and the gate pulse signal The number of times is automatically determined according to the time width.
- control is performed to maintain the boosted output voltage at the ignition set voltage.
- constant voltage control is performed with the ignition set voltage in chopper control (S1d).
- the output current Io rises in the IG voltage rising section and the IG voltage constant voltage section.
- a portion indicated by a symbol D indicates a current rising state in the IG voltage rising section and the IG voltage constant voltage section.
- ignition set current I IGR flows an output current I o of the steady operation by moving to a steady operating state.
- the portion indicated by the symbol E indicates the state of transition to the output current I o in the steady operation where the output current I o exceeding the ignition set current I IGR flows, and the portion indicated by the symbol F It shows the output current I o of the steady-state operation.
- the occurrence of plasma discharge can be determined by the fact that the output voltage V o has reached the steady operation set voltage V R and that the ignition set current I IGR flows in the output current I o .
- the output current that flows when the plasma discharge occurs is determined as the ignition set current I.
- the output voltage is predetermined as the ignition set voltage V IGR
- the output current I o is compared with the set ignition set current I IGR
- the output voltage V o is set as a constant to the set ignition set voltage V IGR
- the constant k is set to, for example, 0.2 to 0.9 (S1e, S1f).
- the constant voltage control set voltage is switched from the ignition set voltage V IGR to the steady operation set voltage V R , and in the inverter controller, the IG generation signal is stopped and the generation of the short-circuit pulse signal P i is stopped. As a result, the ignition mode is terminated and the operation mode is switched to the steady operation mode.
- the output voltage V o shown in FIG. 6 a portion indicated by a symbol C indicates a constant voltage state maintained at the steady operation set voltage V R.
- End of IG-voltage constant voltage section is performed by stopping the short pulse signal P i.
- control of the off-state, when the boosted output voltage reaches the ignition set voltage can be performed by constant voltage control to the ignition setting voltage switching element Q 1 by a pulse width control .
- the chopper control unit performs the constant voltage control in the steady operation setting voltage V R, the inverter control unit performs a normal pulse width control.
- FIG. 8 shows operating states of chopper control and inverter control in the ignition mode and the steady operation mode.
- the chopper control controls the current source step-down chopper so that the output voltage V o can be controlled to the ignition set voltage by pulse width control, and the inverter control performs orthogonal transform control by pulse width control.
- intermittent short-circuit control is performed in the IG voltage rising section in the ignition mode, and the ignition voltage is boosted toward the ignition set voltage V IGR .
- This step-up control can be performed not only by intermittent short-circuit control by inverter control but also by controlling a short-circuit switching element provided on the current source step-down chopper unit side.
- the output voltage is boosted towards the ignition setting voltage V IGR in IG voltage rising period, after reaching the ignition set voltage V IGR is maintained in IG voltage constant voltage section to the ignition setting voltage V IGR.
- the output current rises toward the ignition setting current I IGR .
- FIG. 9 is a timing chart for explaining another configuration example 1 of the DC power supply device.
- the short-circuit pulse signal P i in the configuration example 1 simultaneously turns on all the switching elements of the bridge circuit.
- FIG. 9 The timing chart shown in FIG. 9 is the same as the timing chart shown in FIG. 6 except for the short-circuit pulse signal.
- FIG. 9B shows the short-circuit pulse signal P i and the gate pulse signal G superimposed on each other, and the short-circuit pulse signal P i is shown by a black background pattern.
- the short-circuit pulse signal P i simultaneously turns on and off each switching element Q R , Q S , Q T , Q X , Q y , Q z of the bridge circuit. Even when the short-circuit pulse signal Pi and the gate pulse signal G overlap, the switching element is turned on, so that the short-circuit state can be achieved regardless of the state of the gate pulse signal G.
- FIG. 10 is a timing chart for explaining another configuration example 2 of the DC power supply device.
- the short-circuit pulse signal P i of the configuration example 2 is at least among switching element pairs that form a pair by connecting the positive voltage side and negative voltage side terminals of the bridge circuit in series among the switching elements included in the bridge circuit. One pair of switching elements is simultaneously turned on.
- Short circuit operation can be performed.
- FIG. 10 The timing chart shown in FIG. 10 is the same as the timing chart shown in FIG. 6 except for the short-circuit pulse signal.
- FIG. 10B shows the short circuit pulse signal P i and the gate pulse signal G in an overlapping manner, and the short circuit pulse signal P i is shown by a black background pattern.
- the short-circuit pulse signal P i simultaneously turns on and off the switching elements Q R and Q X of the bridge circuit. Even when the short-circuit pulse signal Pi and the gate pulse signal G overlap, the switching element is turned on, so that the short-circuit state can be achieved regardless of the state of the gate pulse signal G.
- the pair of the positive voltage side and the negative voltage side of the bridge circuit is connected in series at any time point within the time width of the gate pulse signal that turns on each switching element.
- a pulse signal that turns on a switching element that is paired with a switching element that is turned on by a gate pulse signal is generated as a short-circuit pulse signal, and the paired switching elements are simultaneously turned on, Cause a short-circuit operation.
- the short-circuit operation is performed by simultaneously turning on the switching elements at the upper and lower ends of the multiphase inverter section.
- the switching element Q 2 is connected between the positive voltage side and the negative voltage side of the output terminal of the current source step-down chopper section or the input terminal of the multiphase inverter section, and this switching element Q 2. To cause a short circuit.
- FIG. 11 is a configuration diagram for explaining another configuration example 4 of the DC power supply device.
- Configuration Example 4 the DC power supply apparatus shown in FIG. 1, to connect the switching element Q 2 between the positive voltage side and a negative voltage side output terminal of the current-step-down chopper unit 30, the switching element Q 2
- the switching control unit 91 controls the on / off operation.
- the selection from constant voltage control, constant current control, and constant power control can be made as required. For example, it is selected in advance and set in the switching circuit of the chopper controller. It can be set from outside the DC power supply. Moreover, it is good also as a structure which changes selection.
- the current source inverter device of the present invention can be applied as a power source for supplying power to a plasma generator and performing film formation or etching.
Abstract
Description
本発明のプラズマ発生装置に直流電力を供給する直流電源装置は、直流源を構成する電流形降圧チョッパ部と、電流形降圧チョッパ部の直流出力を複数のスイッチング素子の動作により多相の交流電力に変換する多相インバータ部と、多相インバータ部の出力を交直変換し、得られた直流を負荷に供給する整流部と、電流形降圧チョッパ部を制御するチョッパ制御部、および多相インバータ部を制御するインバータ制御部を有する制御部を備える。 [DC power supply]
A DC power supply apparatus for supplying DC power to a plasma generator according to the present invention includes a current source step-down chopper unit constituting a DC source, and the DC output of the current source step-down chopper unit by using a plurality of switching elements to operate multi-phase AC power. A multi-phase inverter unit that converts the output of the multi-phase inverter unit into an AC / DC converter, a rectifier unit that supplies the obtained direct current to a load, a chopper control unit that controls the current source step-down chopper unit, and a multi-phase inverter unit The control part which has an inverter control part which controls is provided.
本発明のインバータ制御部による間欠短絡制御の第1の形態は、多相インバータを構成するブリッジ回路のスイッチング素子をパルス幅制御するゲートパルス信号を生成すると共に、ブリッジ回路の正電圧側と負電圧側とを間欠的に短絡する短絡パルス信号とを生成し、生成したゲートパルス信号と短絡パルス信号とを重畳して制御信号を生成し、この制御信号によって多相インバータ部を制御する。 (First form of intermittent short-circuit control by inverter control unit)
The first form of intermittent short-circuit control by the inverter control unit of the present invention generates a gate pulse signal that controls the pulse width of the switching element of the bridge circuit that constitutes the multiphase inverter, and at the same time, the positive voltage side and the negative voltage of the bridge circuit A short circuit pulse signal that intermittently shorts the side is generated, a control signal is generated by superimposing the generated gate pulse signal and the short circuit pulse signal, and the multiphase inverter unit is controlled by this control signal.
本発明のインバータ制御部による間欠短絡制御の第2の形態は、多相インバータを構成するブリッジ回路のスイッチング素子をパルス幅制御するゲートパルス信号を生成すると共に、各スイッチング素子をオン状態とするゲートパルス信号の時間幅内の何れかの時点において、ブリッジ回路の正電圧側と負電圧側との端子間を直列接続して対を成すペアのスイッチング素子の内、ゲートパルス信号でオン動作するスイッチング素子と対の関係にあるスイッチング素子をオン動作させるパルス信号を短絡パルス信号として生成し、生成したゲートパルス信号と短絡パルス信号とを重畳して制御信号を生成し、この制御信号によって多相インバータ部を制御する。 (Second form of intermittent short-circuit control by inverter control unit)
The second form of intermittent short-circuit control by the inverter control unit of the present invention is a gate that generates a gate pulse signal that controls the pulse width of the switching elements of the bridge circuit that constitutes the multiphase inverter, and that turns on each switching element. Switching that is turned on by a gate pulse signal among a pair of switching elements that are connected in series between the positive voltage side and negative voltage side terminals of the bridge circuit at any point within the time width of the pulse signal A pulse signal that turns on the switching element that is paired with the element is generated as a short-circuit pulse signal, and a control signal is generated by superimposing the generated gate pulse signal and the short-circuit pulse signal. Control part.
本発明のインバータ制御部による間欠短絡制御の第3の形態は、多相インバータを構成するブリッジ回路のスイッチング素子をパルス幅制御するゲートパルス信号と、ブリッジ回路の全てのスイッチング素子を同時にオン動作させるパルス信号を短絡パルス信号として生成し、生成したゲートパルス信号と短絡パルス信号とを重畳して制御信号を生成し、この制御信号によって多相インバータ部を制御する。 (Third form of intermittent short-circuit control by the inverter controller)
The third form of intermittent short-circuit control by the inverter control unit of the present invention is to simultaneously turn on all the switching elements of the bridge circuit and the gate pulse signal for controlling the pulse width of the switching elements of the bridge circuit constituting the multiphase inverter. A pulse signal is generated as a short circuit pulse signal, a control signal is generated by superimposing the generated gate pulse signal and the short circuit pulse signal, and the multiphase inverter unit is controlled by this control signal.
本発明のインバータ制御部による間欠短絡制御の第4の形態は、多相インバータを構成するブリッジ回路のスイッチング素子をパルス幅制御するゲートパルス信号を生成すると共に、ブリッジ回路が備えるスイッチング素子の内で、ブリッジ回路の正電圧側と負電圧側の端子間を直列接続して対を成すスイッチング素子のペアの内で少なくとも一つのペアのスイッチング素子を同時にオン動作させるパルス信号を短絡パルス信号として生成し、生成したゲートパルス信号と短絡パルス信号とを重畳して制御信号を生成し、この制御信号によって多相インバータ部を制御する。 (Fourth form of intermittent short-circuit control by the inverter controller)
The fourth form of intermittent short-circuit control by the inverter control unit of the present invention generates a gate pulse signal for controlling the pulse width of the switching element of the bridge circuit constituting the multiphase inverter, and includes the switching element included in the bridge circuit. A pulse signal is generated as a short-circuit pulse signal that simultaneously turns on at least one pair of switching elements among a pair of switching elements that form a pair by connecting the positive voltage side and negative voltage side terminals of the bridge circuit in series. The generated gate pulse signal and the short-circuit pulse signal are superimposed to generate a control signal, and the multiphase inverter unit is controlled by this control signal.
本発明の間欠短絡制御は、上記したようにインバータ制御部が行う態様の他に、電流形降圧チョッパ制御部が行う態様とすることができる。 (Intermittent short circuit control by current source step-down chopper controller)
The intermittent short-circuit control of the present invention can be performed by the current source step-down chopper control unit in addition to the mode performed by the inverter control unit as described above.
直流電源装置は、直流源を構成する電流形降圧チョッパ部と、電流形降圧チョッパ部の直流出力を複数のスイッチング素子の動作により多相の交流電力に変換する多相インバータ部と、多相インバータ部の出力を交直変換し、得られた直流を負荷に供給する整流部と、電流形降圧チョッパ部を制御するチョッパ制御部、および多相インバータ部を制御するインバータ制御部とを有する制御部を備え、直流電力をプラズマ発生装置に供給する。 [DC power supply control method]
The DC power supply device includes a current source step-down chopper unit that constitutes a DC source, a multi-phase inverter unit that converts the DC output of the current source step-down chopper unit into multi-phase AC power by operation of a plurality of switching elements, and a multi-phase inverter. A control unit having a rectifying unit that converts the output of the unit into an AC / DC converter and supplies the obtained direct current to the load, a chopper control unit that controls the current source step-down chopper unit, and an inverter control unit that controls the multiphase inverter unit And supply DC power to the plasma generator.
はじめに、本発明の直流電源装置の構成例について図2~図4を用いて説明する。図2は本発明の直流電源装置の全体の構成を説明するための図であり、図3は本発明の直流電源装置が備えるチョッパ制御部の構成例を説明するための図であり、図4は本発明の直流電源装置が備えるインバータ制御部の構成例を説明するための図である。 [Configuration example of DC power supply]
First, a configuration example of the DC power supply device of the present invention will be described with reference to FIGS. 2 is a diagram for explaining the overall configuration of the DC power supply device of the present invention, and FIG. 3 is a diagram for explaining a configuration example of a chopper control unit provided in the DC power supply device of the present invention. These are the figures for demonstrating the structural example of the inverter control part with which the DC power supply device of this invention is provided.
チョッパ制御部70は電流形降圧チョッパ部30のスイッチング素子をパルス幅制御によって、イグニッションモードでは定電圧制御を行い、定常運転モードでは定電圧制御、定電流制御、あるいは定電力制御から選択した何れかの制御を行う。イグニッションモードと定常運転モードにおいてそれぞれ異なる設定値に切り換えて制御を行う。イグニッションモードではイグニッション設定電圧VIGRに設定し、定常運転モードにおいて、定電圧制御では定常運転設定電圧VRに設定し、定電流制御では定常運転設定電流IRに設定し、定電力制御では定常運転設定電力PRに設定する。 Next, a configuration example of the
The
インバータ制御部80は多相インバータ部40のスイッチング素子のオン・オフ動作を制御し、直流から交流への直交変換、および、電流形降圧チョッパ部に短絡電流に生成を行う。 Next, a configuration example of the
The
次に、本願発明の直流電源装置のイグニッションモードおよび定常運転モードの動作例について、図5のフローチャート、図6のタイミングチャート、図7のイグニッション時の回路状態、および図8のイグニッションモード,定常運転モードの動作状態図を用いて説明する。なお、以下では、定常運転モードとして定電圧制御を選択し、定常運転設定電圧VRを設定値とする場合について説明する。 [Operation example of DC power supply]
Next, regarding the operation example of the ignition mode and steady operation mode of the DC power supply device of the present invention, the flowchart of FIG. 5, the timing chart of FIG. 6, the circuit state at the time of ignition of FIG. 7, and the ignition mode and steady operation of FIG. The operation will be described with reference to a mode operation state diagram. In the following, select the constant voltage control as the normal operation mode, the case where the set value of the steady operation setting voltage V R.
チョッパ制御部は、出力電圧をイグニッション設定電圧まで昇圧させるIG電圧上昇区間の制御(S1a~S1c)と、昇圧した出力電圧をイグニッション設定電圧に維持するIG電圧定電圧区間の制御(S1d~S1f)の2つの区間によってイグニッションモードの制御を行う。一方、インバータ制御部は、イグニッションモードS1中において、ゲートパルス信号Gによるインバータ制御と短絡パルス信号Piによる間欠短絡制御を行う。 First, the ignition mode S1 will be described.
The chopper controller controls the IG voltage rise interval (S1a to S1c) that boosts the output voltage to the ignition set voltage, and the IG voltage constant voltage interval control (S1d to S1f) that maintains the boosted output voltage at the ignition set voltage The ignition mode is controlled by these two sections. On the other hand, the inverter control unit performs inverter control by the gate pulse signal G and intermittent short-circuit control by the short-circuit pulse signal P i during the ignition mode S1.
IG電圧上昇区間において、出力電圧をイグニッション設定電圧まで昇圧させる制御を行う。インバータ制御では、多相インバータ部が備えるブリッジ回路の各相のスイッチング素子を駆動制御するゲートパルス信号Gを生成し(S1A)、イグニッションモードの区間を定めるイグニッション(IG)発生信号を立ち上げる(S1B)。イグニッション(IG)発生信号の立ち上げに伴って短絡パルス信号Piを生成する(S1C)。 (Control of IG voltage rise section)
In the IG voltage rising section, control is performed to boost the output voltage to the ignition set voltage. In the inverter control, a gate pulse signal G for driving and controlling the switching elements of each phase of the bridge circuit included in the multi-phase inverter unit is generated (S1A), and an ignition (IG) generation signal that determines an ignition mode section is started (S1B). ). A short-circuit pulse signal P i is generated in accordance with the rise of the ignition (IG) generation signal (S1C).
図7はイグニッション時の短絡状態を示している。図7では、3相インバータのブリッジ回路において、スイッチング素子QRとスイッチング素子QXとを同時にオン状態とすることによって正電圧側と負電圧側の間(ブリッジ回路の上下端)を短絡する例を示している。 Hereinafter, the boosting operation by the short circuit current will be described.
FIG. 7 shows a short circuit state at the time of ignition. In FIG. 7, in the bridge circuit of the three-phase inverter, the switching element Q R and the switching element Q X are simultaneously turned on to short-circuit between the positive voltage side and the negative voltage side (upper and lower ends of the bridge circuit). Is shown.
Δi1=(Vin/LF1)×Tion(n) …(1)
Ji(n)=(1/2)×LF1×Δi1 2 …(2) Energy J i (n) due to the short-circuit current Δi is accumulated in the DC reactor L F1 of the current source step-down chopper unit. When the input voltage to the DC reactor L F1 is V in , the short-circuit current Δi 1 and the energy J i (n) for one short time width T ion (n) and the short-circuit current Δi 1 are expressed by the following equation (1), It is represented by (2).
Δi 1 = (V in / L F1 ) × T ion (n) (1)
J i (n) = (1/2) × L F1 × Δi 1 2 (2)
Ji(n)=(1/2)×LF1×Δi1 2
=(1/2)×COT×(Vo(n) 2-Vo(n-1) 2) …(3)
ただし、最初の短絡動作を行う前の出力電圧はVo(0)=0としている。 Here, the energy J i (n) sent to the output-side capacitance C OT by the short-circuit operation when the output-side capacitance of the DC power supply device is C OT and the output voltage at the time of ignition is V o (n). Is represented by the following formula (3). Note that the output side capacitance C OT can be the output capacitance C FO and the electrode capacitance C o of the plasma generator as a load.
J i (n) = (1/2) × L F1 × Δi 1 2
= (1/2) × C OT × (V o (n) 2 −V o (n−1) 2 ) (3)
However, the output voltage before the first short-circuit operation is set to V 0 (0) = 0.
Vo(n)={(LF1/COT)×Δi1 2+Vo(n-1) 2}1/2 …(4)
式(4)は、短絡動作をn回繰り返したときの出力電圧Vo(n)を表している。 From the expression (3), the output voltage V o (n) at the time of ignition is expressed by the following expression (4).
V o (n) = {(L F1 / C OT ) × Δi 1 2 + V o (n−1) 2 } 1/2 (4)
Equation (4) represents the output voltage V o (n) when the short-circuit operation is repeated n times.
Vo(1)={(LF1/COT)×Δi1 2}1/2 …(5)
Vo(2)={(LF1/COT)×Δi1 2+Vo(1) 2}1/2 …(6)
Vo(3)={(LF1/COT)×Δi1 2+Vo(2) 2}1/2 …(7) When the short-circuit operation is performed three times (n = 3), the output voltage at each short-circuit operation is expressed by the following equation.
V o (1) = {(L F1 / C OT ) × Δi 1 2 } 1/2 (5)
V o (2) = {(L F1 / C OT ) × Δi 1 2 + V o (1) 2 } 1/2 (6)
V o (3) = {(L F1 / C OT ) × Δi 1 2 + V o (2) 2 } 1/2 (7)
IG電圧定電圧区間において、昇圧した出力電圧をイグニッション設定電圧に維持する制御を行う。 (Control of IG voltage constant voltage section)
In the IG voltage constant voltage section, control is performed to maintain the boosted output voltage at the ignition set voltage.
次に、直流電源装置の他の構成例について説明する。 [Other configuration examples of DC power supply]
Next, another configuration example of the DC power supply device will be described.
図9は直流電源装置の他の構成例1を説明するためのタイミングチャートである。構成例1の短絡パルス信号Piは、ブリッジ回路の全てのスイッチング素子を同時にオン動作させるものである。この短絡パルス信号Piを用いてブリッジ回路の全てのスイッチング素子を同時にオン状態とすることによって、ブリッジ回路のスイッチング素子のオン状態やオフ状態に係わらず、短絡動作を行わせることができる。 (Other configuration example 1 of a DC power supply device)
FIG. 9 is a timing chart for explaining another configuration example 1 of the DC power supply device. The short-circuit pulse signal P i in the configuration example 1 simultaneously turns on all the switching elements of the bridge circuit. By the simultaneous ON state all the switching elements of the bridge circuit by using the short pulse signal P i, regardless of the ON state and OFF state of the switching elements of the bridge circuit, it is possible to perform the short-circuit operation.
図10は直流電源装置の他の構成例2を説明するためのタイミングチャートである。構成例2の短絡パルス信号Piは、ブリッジ回路が備えるスイッチング素子の内で、ブリッジ回路の正電圧側と負電圧側の端子間を直列接続して対を成すスイッチング素子のペアの内で少なくとも一つのペアのスイッチング素子を同時にオン動作させるものである。 (Other configuration example 2 of the DC power supply device)
FIG. 10 is a timing chart for explaining another configuration example 2 of the DC power supply device. The short-circuit pulse signal P i of the configuration example 2 is at least among switching element pairs that form a pair by connecting the positive voltage side and negative voltage side terminals of the bridge circuit in series among the switching elements included in the bridge circuit. One pair of switching elements is simultaneously turned on.
構成例3は、各スイッチング素子をオン状態とするゲートパルス信号の時間幅内の何れかの時点において、ブリッジ回路の正電圧側と負電圧側との端子間を直列接続して対を成すペアのスイッチング素子の内、ゲートパルス信号でオン動作するスイッチング素子と対の関係にあるスイッチング素子をオン動作させるパルス信号を短絡パルス信号として生成し、対と成るペアのスイッチング素子を同時にオン動作させ、短絡動作を行わせる。 (Other configuration example 3 of the DC power supply device)
In the configuration example 3, the pair of the positive voltage side and the negative voltage side of the bridge circuit is connected in series at any time point within the time width of the gate pulse signal that turns on each switching element. Among the switching elements, a pulse signal that turns on a switching element that is paired with a switching element that is turned on by a gate pulse signal is generated as a short-circuit pulse signal, and the paired switching elements are simultaneously turned on, Cause a short-circuit operation.
図11は直流電源装置の他の構成例4を説明するための構成図である。構成例4は、図1に示した直流電源装置において、電流形降圧チョッパ部30の出力端の正電圧側と負電圧側との間にスイッチング素子Q2を接続し、このスイッチング素子Q2をスイッチング制御部91でオン・オフ動作を制御する。 (Other configuration example 4 of the DC power supply device)
FIG. 11 is a configuration diagram for explaining another configuration example 4 of the DC power supply device. Configuration Example 4, the DC power supply apparatus shown in FIG. 1, to connect the switching element Q 2 between the positive voltage side and a negative voltage side output terminal of the current-step-down
2 交流電源
3 出力ケーブル
4 プラズマ発生装置
10 整流部
20 スナバー部
30 電流形降圧チョッパ部
40 多相インバータ部
50 多相変圧部
51 相変圧器
60 多相整流部
70 チョッパ制御部
70a スイッチング素子制御信号生成回路
70b 切り換え回路
70c メモリ手段(イグニッション設定値)
70d メモリ手段(定常運転設定電圧)
70e 比較回路
70f メモリ手段(イグニッション設定電流)
70g メモリ手段(プラズマ発生設定電圧)
80 インバータ制御部
80a 制御信号出力部
80b 加算回路
80c ゲートパルス信号生成回路
80d 短絡パルス信号生成回路
90 配線
91 スイッチング制御部
92 スイッチング制御部
IIGR イグニッション設定電流
Io 出力電流
IR 定常運転設定電流
PR 定常運転設定電力
VIGR イグニッション設定電圧
Vin 入力電圧
Vo 出力電圧
VPLR プラズマ発生設定電圧
VR 定常運転設定電圧
Δi 短絡電流 DESCRIPTION OF SYMBOLS 1 DC power supply device 2 AC power supply 3
70d Memory means (set voltage for steady operation)
70g Memory means (Plasma generation set voltage)
80
Claims (14)
- プラズマ発生装置に直流電力を供給する直流電源装置において、
直流源を構成する電流形降圧チョッパ部と、
前記電流形降圧チョッパ部の直流出力を複数のスイッチング素子の動作により多相の交流電力に変換する多相インバータ部と、
前記多相インバータ部の出力を交直変換し、得られた直流を負荷に供給する整流部と、前記電流形降圧チョッパ部を制御するチョッパ制御部、および前記多相インバータ部を制御するインバータ制御部とを有する制御部を備え、
前記制御部は、前記チョッパ制御部が制御する、前記プラズマ発生装置にプラズマ放電を発生させるイグニッション電圧を供給するイグニッションモードと、前記プラズマ発生装置のプラズマ放電を継続させる定常運転モードとを切り換える切換制御、および、
前記電流形降圧チョッパ部の正電圧側と負電圧側との間、または前記多相インバータ部の正電圧側と負電圧側との間を間欠的に短絡する間欠短絡制御を行い、
前記制御部は、前記イグニッションモードにおいて、前記間欠短絡制御によって前記電流形降圧チョッパ部に流れる短絡電流による昇圧動作を制御し、プラズマ発生装置に印加する出力電圧を制御することを特徴とする、直流電源装置。 In a DC power supply that supplies DC power to a plasma generator,
A current source step-down chopper that constitutes a DC source;
A multi-phase inverter unit that converts the DC output of the current source step-down chopper unit into multi-phase AC power by operation of a plurality of switching elements;
A rectification unit that converts the output of the multiphase inverter unit into AC / DC and supplies the obtained direct current to a load, a chopper control unit that controls the current source step-down chopper unit, and an inverter control unit that controls the multiphase inverter unit And a control unit having
The control unit controls switching between an ignition mode for supplying an ignition voltage for generating plasma discharge to the plasma generator and a steady operation mode for continuing plasma discharge of the plasma generator controlled by the chopper controller. ,and,
Performing intermittent short-circuit control for intermittently short-circuiting between the positive voltage side and negative voltage side of the current source step-down chopper unit or between the positive voltage side and negative voltage side of the multiphase inverter unit,
In the ignition mode, the control unit controls a boost operation by a short-circuit current flowing in the current source step-down chopper unit by the intermittent short-circuit control, and controls an output voltage applied to the plasma generator. Power supply. - 前記制御部は、前記インバータ制御部により前記間欠短絡制御を行い、
前記インバータ制御部は、前記間欠短絡制御において、
多相インバータを構成するブリッジ回路のスイッチング素子をパルス幅制御するゲートパルス信号と、前記ブリッジ回路の正電圧側と負電圧側とを間欠的に短絡する短絡パルス信号とを生成し、
前記ゲートパルス信号と短絡パルス信号とを重畳した制御信号により前記多相インバータ部を制御し、
前記短絡パルス信号によって前記ブリッジ回路の正電圧側と負電圧側との端子間を直列接続して対を成すペアのスイッチング素子を同時にオン状態とし、ブリッジ回路の正電圧側と負電圧側の端子間を短絡することを特徴とする、請求項1に記載の直流電源装置。 The control unit performs the intermittent short circuit control by the inverter control unit,
In the intermittent short circuit control, the inverter control unit,
A gate pulse signal for controlling the pulse width of the switching element of the bridge circuit constituting the multiphase inverter, and a short-circuit pulse signal for intermittently short-circuiting the positive voltage side and the negative voltage side of the bridge circuit,
Control the multi-phase inverter unit by a control signal in which the gate pulse signal and the short-circuit pulse signal are superimposed,
A pair of switching elements that are connected in series between the positive voltage side and the negative voltage side of the bridge circuit by the short-circuit pulse signal are simultaneously turned on, and the positive voltage side and negative voltage side terminals of the bridge circuit The DC power supply device according to claim 1, wherein a short circuit is provided between them. - 前記インバータ制御部は、
前記各スイッチング素子をオン状態とするゲートパルス信号の時間幅内の何れかの時点において、前記ブリッジ回路の正電圧側と負電圧側との端子間を直列接続して対を成すペアのスイッチング素子の内、ゲートパルス信号でオン動作するスイッチング素子と対の関係にあるスイッチング素子をオン動作させるパルス信号を前記短絡パルス信号として生成し、
前記ゲートパルス信号によりオン状態となるスイッチング素子と、前記短絡パルス信号によりオン状態となるスイッチング素子とによってブリッジ回路の正電圧側と負電圧側とを短絡することを特徴とする、請求項2に記載の直流電源装置。 The inverter control unit
A pair of switching elements that form a pair by connecting the terminals of the positive voltage side and the negative voltage side of the bridge circuit in series at any point within the time width of the gate pulse signal that turns on each of the switching elements. Among them, a pulse signal for turning on a switching element that is paired with a switching element that is turned on by a gate pulse signal is generated as the short circuit pulse signal,
3. The positive voltage side and the negative voltage side of the bridge circuit are short-circuited by a switching element that is turned on by the gate pulse signal and a switching element that is turned on by the short-circuit pulse signal. The direct current power supply device described. - 前記インバータ制御部は、前記ブリッジ回路の全てのスイッチング素子を同時にオン動作させるパルス信号を前記短絡パルス信号として生成し、
前記短絡パルス信号によりブリッジ回路の全てのスイッチング素子をオン状態とし、ブリッジ回路の正電圧側と負電圧側とを短絡することを特徴とする、請求項2に記載の直流電源装置。 The inverter control unit generates a pulse signal that simultaneously turns on all the switching elements of the bridge circuit as the short-circuit pulse signal,
The DC power supply device according to claim 2, wherein all the switching elements of the bridge circuit are turned on by the short-circuit pulse signal, and the positive voltage side and the negative voltage side of the bridge circuit are short-circuited. - 前記インバータ制御部は、前記ブリッジ回路が備えるスイッチング素子の内で、ブリッジ回路の正電圧側と負電圧側の端子間を直列接続して対を成すスイッチング素子のペアの内で少なくとも一つのペアのスイッチング素子を同時にオン動作させるパルス信号を前記短絡パルス信号として生成し、
前記短絡パルス信号によりブリッジ回路の正電圧側と負電圧側の端子間を直列接続して対を成すペアのスイッチング素子の少なくとも一つのペアのスイッチング素子をオン状態とし、ブリッジ回路の正電圧側と負電圧側とを短絡することを特徴とする、請求項2に記載の直流電源装置。 The inverter control unit includes at least one of a pair of switching elements that form a pair by connecting the terminals on the positive voltage side and the negative voltage side of the bridge circuit in series among the switching elements included in the bridge circuit. A pulse signal for simultaneously turning on the switching elements is generated as the short-circuit pulse signal,
The short-circuit pulse signal turns on at least one pair of switching elements of the pair of switching elements connected in series between the positive voltage side and negative voltage side terminals of the bridge circuit, and the positive voltage side of the bridge circuit The DC power supply device according to claim 2, wherein the negative voltage side is short-circuited. - 前記電流形降圧チョッパ部と前記多相インバータ部との間において、正電圧側と負電圧側と間に短絡用スイッチング素子を備え、
前記制御部は、前記チョッパ制御部により前記間欠短絡制御を行い、
前記チョッパ制御部は、前記短絡用スイッチング素子を間欠的に短絡する短絡パルス信号を生成し、
前記短絡パルス信号によって前記短絡用スイッチング素子をオン状態とすることによって電流形降圧チョッパ部の出力端の正電圧側と負電圧側とを短絡することを特徴とする、請求項1に記載の直流電源装置。 Between the current source step-down chopper part and the multiphase inverter part, a short-circuit switching element is provided between the positive voltage side and the negative voltage side,
The control unit performs the intermittent short circuit control by the chopper control unit,
The chopper control unit generates a short-circuit pulse signal that intermittently short-circuits the short-circuit switching element,
2. The direct current according to claim 1, wherein the positive voltage side and the negative voltage side of the output terminal of the current source step-down chopper unit are short-circuited by turning on the short-circuit switching element by the short-circuit pulse signal. Power supply. - 前記イグニッションモードにおいて、前記制御部は、短絡電流による昇圧を複数回繰り返して出力電圧をイグニッション設定電圧まで電圧上昇させる昇圧制御と、前記チョッパ制御部によって前記出力電圧をイグニッション設定電圧に維持する定電圧制御とを切り換えて行い、
前記出力電圧がイグニッション設定電圧に到達した後、昇圧制御から定電圧制御に切り換えることを特徴とする、請求項1から6の何れかに記載の直流電源装置。 In the ignition mode, the control unit repeats boosting by a short circuit current a plurality of times to increase the output voltage to the ignition set voltage, and the constant voltage that maintains the output voltage at the ignition set voltage by the chopper control unit. Switch between control and
7. The DC power supply device according to claim 1, wherein after the output voltage reaches an ignition set voltage, switching from step-up control to constant voltage control is performed. - 前記制御部は、チョッパ制御部のチョッパ制御のオンデューティー比と、間欠短絡制御の回数とをパラメータとし、
前記オンデューティー比によって前記電流形降圧チョッパ部の入力電圧を制御し、
前記間欠短絡制御の回数によって昇圧比を制御し、
前記入力電圧と昇圧比によって出力電圧の電圧上昇を制御することを特徴とする、請求項7に記載の直流電源装置。 The control unit uses the chopper control on-duty ratio of the chopper control unit and the number of intermittent short-circuit controls as parameters,
Control the input voltage of the current source step-down chopper by the on-duty ratio,
Control the boost ratio by the number of intermittent short-circuit control,
8. The DC power supply device according to claim 7, wherein a voltage increase of the output voltage is controlled by the input voltage and the boost ratio. - 前記定常運転モードは、
定常運転の設定値をイグニッションモードで設定されるイグニッション設定電圧から定常運転設定電圧に切り換えて、出力電圧を定常運転設定電圧に維持する定電圧制御、
定常運転の設定値をイグニッションモードで設定されるイグニッション設定電圧から定常運転設定電流に切り換えて、出力電流を定常運転設定電流に維持する定電流制御、
定常運転の設定値をイグニッションモードで設定されるイグニッション設定電圧から定常運転設定電力に切り換えて、出力電力を定常運転設定電力に維持する定電力制御
の何れかの制御を選択可能であり、
前記制御部の切換制御は、出力電流がイグニッション設定電流に到達し、かつ、出力電圧がプラズマ発生電圧に下降したとき前記イグニションモードから前記定常運転モードに切り換え、前記定電圧制御、前記定電流制御、前記定電力制御から選択した制御を行うことを特徴とする、請求項1に記載の直流電源装置。 The steady operation mode is:
Constant voltage control that maintains the output voltage at the steady operation set voltage by switching the set value for steady operation from the ignition set voltage set in the ignition mode to the steady operation set voltage,
Constant current control that switches the set value for steady operation from the ignition set voltage set in the ignition mode to the steady operation set current and maintains the output current at the steady operation set current,
Either the constant power control that maintains the output power at the steady operation set power by switching the set value of the steady operation from the ignition set voltage set in the ignition mode to the steady operation set power can be selected.
The switching control of the control unit switches from the ignition mode to the steady operation mode when the output current reaches the ignition set current and the output voltage falls to the plasma generation voltage, the constant voltage control, the constant current control 2. The DC power supply device according to claim 1, wherein control selected from the constant power control is performed. - 直流源を構成する電流形降圧チョッパ部と、
前記電流形降圧チョッパ部の直流出力を複数のスイッチング素子の動作により多相の交流電力に変換する多相インバータ部と、
前記多相インバータ部の出力を交直変換し、得られた直流を負荷に供給する整流部と、前記電流形降圧チョッパ部を制御するチョッパ制御部、および前記多相インバータ部を制御するインバータ制御部とを有する制御部を備え、プラズマ発生装置に直流電力を供給する直流電源装置の制御方法において、
前記制御部は、前記チョッパ制御部が制御する、前記プラズマ発生装置にプラズマ放電を発生させるイグニッション電圧を供給するイグニッションモードと、前記プラズマ発生装置のプラズマ放電を継続させる定常運転モードとを切り換える切換制御、および、
前記電流形降圧チョッパ部または前記多相インバータ部の正電圧側と負電圧側とを間欠的に短絡する間欠短絡制御を行い、
前記制御部は、前記イグニッションモードにおいて、前記間欠短絡制御によって前記電流形降圧チョッパ部に流れる短絡電流による昇圧動作を制御し、プラズマ発生装置に印加する出力電圧を制御することを特徴とする、直流電源装置の制御方法。 A current source step-down chopper that constitutes a DC source;
A multi-phase inverter unit that converts the DC output of the current source step-down chopper unit into multi-phase AC power by operation of a plurality of switching elements;
A rectification unit that converts the output of the multiphase inverter unit into AC / DC and supplies the obtained direct current to a load, a chopper control unit that controls the current source step-down chopper unit, and an inverter control unit that controls the multiphase inverter unit In a control method of a DC power supply device that includes a controller having
The control unit controls switching between an ignition mode for supplying an ignition voltage for generating plasma discharge to the plasma generator and a steady operation mode for continuing plasma discharge of the plasma generator controlled by the chopper controller. ,and,
Performing intermittent short-circuit control to intermittently short-circuit the positive voltage side and negative voltage side of the current source step-down chopper unit or the multiphase inverter unit,
In the ignition mode, the control unit controls a boost operation by a short-circuit current flowing in the current source step-down chopper unit by the intermittent short-circuit control, and controls an output voltage applied to the plasma generator. Control method of power supply. - 前記制御部は、前記インバータ制御部により前記間欠短絡制御を行い、
前記インバータ制御部は、前記間欠短絡制御において、
多相インバータを構成するブリッジ回路のスイッチング素子をパルス幅制御するゲートパルス信号と、前記ブリッジ回路の正電圧側と負電圧側とを間欠的に短絡する短絡パルス信号とを生成し、
前記ゲートパルス信号と短絡パルス信号とを重畳して制御信号を生成し、
前記制御信号により前記多相インバータ部を制御し、前記短絡パルス信号によって前記ブリッジ回路の正電圧側と負電圧側との端子間を直列接続して対を成すペアのスイッチング素子を同時にオン状態とし、ブリッジ回路の正電圧側と負電圧側の端子間を短絡することを特徴とする、請求項10に記載の直流電源装置の制御方法。 The control unit performs the intermittent short circuit control by the inverter control unit,
In the intermittent short circuit control, the inverter control unit,
A gate pulse signal for controlling the pulse width of the switching element of the bridge circuit constituting the multiphase inverter, and a short-circuit pulse signal for intermittently short-circuiting the positive voltage side and the negative voltage side of the bridge circuit,
A control signal is generated by superimposing the gate pulse signal and the short-circuit pulse signal,
The multi-phase inverter unit is controlled by the control signal, and the pair of switching elements forming a pair by connecting the positive voltage side and the negative voltage side of the bridge circuit in series by the short circuit pulse signal are simultaneously turned on. 11. The method for controlling a DC power supply device according to claim 10, wherein the positive voltage side and negative voltage side terminals of the bridge circuit are short-circuited. - 前記イグニッションモードにおいて、前記制御部は、短絡電流による昇圧を複数回繰り返して出力電圧をイグニッション設定電圧まで電圧上昇させる昇圧制御と、前記チョッパ制御部によって前記出力電圧をイグニッション設定電圧に維持する定電圧制御とを切り換えて行い、
前記出力電圧がイグニッション設定電圧に到達した後、昇圧制御から定電圧制御に切り換えることを特徴とする、請求項10または11に記載の直流電源装置の制御方法。 In the ignition mode, the control unit repeats boosting by a short circuit current a plurality of times to increase the output voltage to the ignition set voltage, and the constant voltage that maintains the output voltage at the ignition set voltage by the chopper control unit. Switch between control and
12. The method of controlling a DC power supply device according to claim 10, wherein after the output voltage reaches an ignition set voltage, switching from step-up control to constant voltage control is performed. - 前記制御部は、チョッパ制御部のチョッパ制御のオンデューティー比と、間欠短絡制御の回数とをパラメータとし、
前記オンデューティー比によって前記電流形降圧チョッパ部の入力電圧を制御し、
前記間欠短絡制御の回数によって昇圧比を制御し、
前記入力電圧と昇圧比によって出力電圧の電圧上昇を制御することを特徴とする、請求項12に記載の直流電源装置の制御方法。 The control unit uses the chopper control on-duty ratio of the chopper control unit and the number of intermittent short-circuit controls as parameters,
Control the input voltage of the current source step-down chopper by the on-duty ratio,
Control the boost ratio by the number of intermittent short-circuit control,
13. The method of controlling a DC power supply device according to claim 12, wherein a voltage increase of the output voltage is controlled by the input voltage and the boost ratio. - 前記定常運転モードは、
定常運転の設定値をイグニッションモードで設定されるイグニッション設定電圧から定常運転設定電圧に切り換えて、出力電圧を定常運転設定電圧に維持する定電圧制御、
定常運転の設定値をイグニッションモードで設定されるイグニッション設定電圧から定常運転設定電流に切り換えて、出力電流を定常運転設定電流に維持する定電流制御、
定常運転の設定値をイグニッションモードで設定されるイグニッション設定電圧から定常運転設定電力に切り換えて、出力電力を定常運転設定電力に維持する定電力制御
の何れかの制御を選択可能であり、
前記制御部の切換制御は、出力電流がイグニッション設定電流に到達し、かつ、出力電圧がプラズマ発生電圧に下降したとき前記イグニションモードから前記定常運転モードに切り換え、前記定電圧制御、前記定電流制御、前記定電力制御から選択した制御を行うことを特徴とする、請求項10に記載の直流電源装置の制御方法。 The steady operation mode is:
Constant voltage control that maintains the output voltage at the steady operation set voltage by switching the set value for steady operation from the ignition set voltage set in the ignition mode to the steady operation set voltage,
Constant current control that switches the set value for steady operation from the ignition set voltage set in the ignition mode to the steady operation set current and maintains the output current at the steady operation set current,
Either the constant power control that maintains the output power at the steady operation set power by switching the set value of the steady operation from the ignition set voltage set in the ignition mode to the steady operation set power can be selected.
The switching control of the control unit switches from the ignition mode to the steady operation mode when the output current reaches the ignition set current and the output voltage falls to the plasma generation voltage, the constant voltage control, the constant current control The method according to claim 10, wherein control selected from the constant power control is performed.
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JP5399563B2 (en) | 2010-08-18 | 2014-01-29 | 株式会社アルバック | DC power supply |
US9379643B2 (en) * | 2010-12-23 | 2016-06-28 | The Regents Of The University Of Colorado, A Body Corporate | Electrosurgical generator controller for regulation of electrosurgical generator output power |
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2012
- 2012-09-07 KR KR1020157006021A patent/KR101579416B1/en active IP Right Grant
- 2012-09-07 IN IN3106KON2014 patent/IN2014KN03106A/en unknown
- 2012-09-07 JP JP2013555675A patent/JP5634626B2/en active Active
- 2012-09-07 EP EP12884110.3A patent/EP2879471B1/en active Active
- 2012-09-07 WO PCT/JP2012/072854 patent/WO2014038060A1/en active Application Filing
- 2012-09-07 CN CN201280075694.4A patent/CN104604337B/en active Active
- 2012-09-07 US US14/414,816 patent/US9137885B2/en active Active
- 2012-09-07 PL PL12884110T patent/PL2879471T3/en unknown
- 2012-09-07 DE DE12884110.3T patent/DE12884110T1/en active Pending
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- 2013-05-10 TW TW102116690A patent/TWI491317B/en active
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Also Published As
Publication number | Publication date |
---|---|
EP2879471A4 (en) | 2016-07-06 |
TW201412199A (en) | 2014-03-16 |
PL2879471T3 (en) | 2017-09-29 |
KR101579416B1 (en) | 2015-12-21 |
EP2879471B1 (en) | 2017-05-10 |
JP5634626B2 (en) | 2014-12-03 |
CN104604337A (en) | 2015-05-06 |
JPWO2014038060A1 (en) | 2016-08-08 |
KR20150038625A (en) | 2015-04-08 |
IN2014KN03106A (en) | 2015-05-08 |
US20150195896A1 (en) | 2015-07-09 |
DE12884110T1 (en) | 2015-09-24 |
CN104604337B (en) | 2016-05-18 |
EP2879471A1 (en) | 2015-06-03 |
TWI491317B (en) | 2015-07-01 |
US9137885B2 (en) | 2015-09-15 |
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